here is the thing i have done (maybe you can call it tut but i don't know)
first follow the nice tut from falko
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if you have virtual host you can do this(is not skip this section)
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edit munin config file
vi /etc/munin/munin.conf
set the htmldir to
htmldir /var/www/stats/monitoring
then if you have apache with virutal host set this in the httpd.conf file
if you don't know where it is locate httpd.conf
vi httpd.conf
add this below NameVirtualHost *:80

htpasswd -c /var/www/stats.htpasswd admin
if you have compiled apache from source first locate htpasswd
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other wise you can do this
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example your site is www.example.com
make a map called stats.
edit munin config file
vi /etc/munin/munin.conf
set the htmldir to
htmldir /var/www/www.example.com/stats/monitoring